Improve contrast of bio and username text in account info

Add Vagrant support for easy development environments

h-feed, h-card and h-entry

Twitter Cards support

Upgrade EmojiOne to 2.2.7

for local attachments, use them in URLs. Check status privacy
before redirecting to actual file.

Adds support for, among other things, 🏳️‍🌈

Prevent duplicate desktop notifications

Revert "Display native emoji on browsers which support it"

Use system fonts on more platforms

Display native emoji on browsers which support it

Public timeline de-hoist

Differentiate settings links

Automatically position cursor when writing a reply toot

This allows other platforms such as Windows, macOS and iOS to use their system fonts rather than downloading a copy of Roboto. It also makes the app feel a little closer to native on those platforms!

The "settings" links in the Getting Started section (or, if #399 were to happen, "more" menu) and compose sections are now different; the "compose" link is "Edit profile," while the one in the Getting Started section is now "Preferences."

All languages have been updated to accommodate this, based on the existing usages of these phrases in language files in the Rails part of the app!

addresses part of #384

"Reblog" -> "boost" in more places

Don't render the media list when there's no media

Friendlier unknown errors

Fix Command-enter tooting

Don't ask users to check the console - if they're on mobile, they probably can't anyway ;)

metaKey is only set correctly on keyDown, not keyUp, so this swaps to using that